return {
  ["a"] = 0,
  ["b"] = 0,
  ["c"] = 0,
  ["d"] = 0,
  ["e"] = 0,
  ["f"] = 0,
  ["g"] = 0,
  ["h"] = 0,
  ["i"] = 0,
  ["j"] = 0,
  ["k"] = 0,
  ["l"] = 0,
  ["m"] = 0,
  ["n"] = 0,
  ["o"] = 0,
  ["p"] = 0,
  ["q"] = 0,
  ["r"] = 0,
  ["s"] = 0,
  ["t"] = 0,
  ["u"] = 0,
  ["v"] = 0,
  ["w"] = 0,
  ["x"] = 0,
  ["y"] = 0,
  ["z"] = 0,
  ["A"] = 0,
  ["B"] = 0,
  ["C"] = 0,
  ["D"] = 0,
  ["E"] = 0,
  ["F"] = 0,
  ["G"] = 0,
  ["H"] = 0,
  ["I"] = 0,
  ["J"] = 0,
  ["K"] = 0,
  ["L"] = 0,
  ["M"] = 0,
  ["N"] = 0,
  ["O"] = 0,
  ["P"] = 0,
  ["Q"] = 0,
  ["R"] = 0,
  ["S"] = 0,
  ["T"] = 0,
  ["U"] = 0,
  ["V"] = 0,
  ["W"] = 0,
  ["X"] = 0,
  ["Y"] = 0,
  ["Z"] = 0,
  ["al"] = 0,
  ["be"] = 0,
  ["ga"] = 0,
  ["de"] = 0,
  ["ep"] = 0,
  ["ze"] = 0,
  ["et"] = 0,
  ["th"] = 0,
  ["io"] = 0,
  ["ka"] = 0,
  ["la"] = 0,
  ["mu"] = 0,
  ["nu"] = 0,
  ["xi"] = 0,
  ["pi"] = 0,
  ["rh"] = 0,
  ["si"] = 0,
  ["ta"] = 0,
  ["up"] = 0,
  ["ph"] = 0,
  ["ch"] = 0,
  ["ps"] = 0,
  ["om"] = 0,
  ["ep*"] = 0,
  ["ka*"] = 0,
  ["th*"] = 0,
  ["pi*"] = 0,
  ["rh*"] = 0,
  ["si*"] = 0,
  ["ph*"] = 0,
  ["ga*"] = 0,
  ["Al"] = 0,
  ["Be"] = 0,
  ["Ga"] = 0,
  ["De"] = 0,
  ["Ep"] = 0,
  ["Ze"] = 0,
  ["Et"] = 0,
  ["Th"] = 0,
  ["Io"] = 0,
  ["Ka"] = 0,
  ["La"] = 0,
  ["Mu"] = 0,
  ["Nu"] = 0,
  ["Xi"] = 0,
  ["Pi"] = 0,
  ["Rh"] = 0,
  ["Si"] = 0,
  ["Ta"] = 0,
  ["Up"] = 0,
  ["Ph"] = 0,
  ["Ch"] = 0,
  ["Ps"] = 0,
  ["Om"] = 0,
  ["Ga*"] = 0,
  ["De*"] = 0,
  ["Th*"] = 0,
  ["La*"] = 0,
  ["Xi*"] = 0,
  ["Pi*"] = 0,
  ["Si*"] = 0,
  ["Up*"] = 0,
  ["Ph*"] = 0,
  ["Ps*"] = 0,
  ["Om*"] = 0,
  ["dd"] = 0,
  ["pd"] = 0,
  ["na"] = 0,
  ["inf"] = 0,
  ["O/"] = 0,
  ["Co"] = 0,
  ["CC"] = 1,
  ["HH"] = 1,
  ["NN"] = 1,
  ["PP"] = 1,
  ["QQ"] = 1,
  ["RR"] = 1,
  ["SS"] = 1,
  ["ZZ"] = 1,
  ["div"] = 2,
  ["gcd"] = 2,
  ["min"] = 2,
  ["max"] = 2,
  ["ifm"] = 2,
  ["sup"] = 2,
  ["sin"] = 2,
  ["cos"] = 2,
  ["tan"] = 2,
  ["tg"] = 2,
  ["cot"] = 2,
  ["sec"] = 2,
  ["csc"] = 2,
  ["cosec"] = 2,
  ["asin"] = 2,
  ["acos"] = 2,
  ["atan"] = 2,
  ["atg"] = 2,
  ["actg"] = 2,
  ["sinh"] = 2,
  ["cosh"] = 2,
  ["tanh"] = 2,
  ["exp"] = 2,
  ["log"] = 2,
  ["ln"] = 2,
  ["lg"] = 2,
  ["det"] = 2,
  ["ker"] = 2,
  ["dim"] = 2,
  ["lim"] = 2,
  ["limsup"] = 2,
  ["liminf"] = 2,
  ["arg"] = 2,
  ["not"] = 3,
  ["and"] = 3,
  ["or"] = 3,
  ["all"] = 3,
  ["ex"] = 3,
  ["==>"] = 3,
  ["<=="] = 3,
  ["<=>"] = 3,
  [":"] = 3,
  ["="] = 3,
  ["!="] = 3,
  ["/="] = 3,
  ["=="] = 3,
  ["<"] = 3,
  [">"] = 3,
  ["<="] = 3,
  [">="] = 3,
  ["in"] = 3,
  ["ni"] = 3,
  ["nin"] = 3,
  ["s<"] = 3,
  ["s<="] = 3,
  ["s>"] = 3,
  ["s>="] = 3,
  [":="] = 3,
  ["=:"] = 3,
  ["~"] = 3,
  ["~="] = 3,
  ["=~"] = 3,
  ["~~"] = 3,
  [".="] = 3,
  ["<<"] = 3,
  [">>"] = 3,
  ["<<<"] = 3,
  [">>>"] = 3,
  ["<>"] = 3,
  ["><"] = 3,
  ["::"] = 3,
  ["++"] = 3,
  ["**"] = 3,
  ["***"] = 3,
  ["Cap"] = 3,
  ["Cup"] = 3,
  ["And"] = 3,
  ["Or"] = 3,
  ["O+"] = 3,
  ["O*"] = 3,
  ["O*x"] = 3,
  ["ig"] = 3,
  ["iig"] = 3,
  ["iiig"] = 3,
  ["oig"] = 3,
  ["oiig"] = 3,
  ["oiiig"] = 3,
  ["+"] = 3,
  ["-"] = 3,
  ["*"] = 3,
  ["*x"] = 3,
  ["div"] = 3,
  ["+-"] = 3,
  ["-+"] = 3,
  ["oo"] = 3,
  ["o+"] = 3,
  ["o-"] = 3,
  ["o*"] = 3,
  ["o*x"] = 3,
  ["o/"] = 3,
  ["*a"] = 3,
  ["->"] = 3,
  ["<-"] = 3,
  ["=>"] = 3,
  ["<-="] = 3,
  ["<->"] = 3,
  ["->->"] = 3,
  ["<-<-"] = 3,
  ["-><-"] = 3,
  ["<-*->"] = 3,
  [":->"] = 3,
  ["cap"] = 3,
  ["cup"] = 3,
  ["s-"] = 3,
  ["..l"] = 3,
  ["..c"] = 3,
  ["..d"] = 3,
  ["..v"] = 3,
  ["..+"] = 3,
  ["..*"] = 3,
  ["..*x"] = 3,
  ["..cap"] = 3,
  ["..cup"] = 3,
  ["..and"] = 3,
  ["..or"] = 3,
  ["p<"] = 3,
  [">p"] = 3,
  ["b<"] = 3,
  [">b"] = 3,
  ["B<"] = 3,
  [">B"] = 3,
  ["a<"] = 3,
  [">a"] = 3,
}
